163378531813 has 8 divisors (see below), whose sum is σ = 186753774528. Its totient is φ = 140012152224.

The previous prime is 163378531793. The next prime is 163378531829. The reversal of 163378531813 is 318135873361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163378531813 - 2²⁵ = 163344977381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163378531873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2176231 + ... + 2250052.

It is an arithmetic number, because the mean of its divisors is an integer number (23344221816).

Almost surely, 2^163378531813 is an apocalyptic number.

It is an amenable number.

163378531813 is a deficient number, since it is larger than the sum of its proper divisors (23375242715).

163378531813 is an equidigital number, since it uses as much as digits as its factorization.

163378531813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4431563.

The product of its digits is 1088640, while the sum is 49.

The spelling of 163378531813 in words is "one hundred sixty-three billion, three hundred seventy-eight million, five hundred thirty-one thousand, eight hundred thirteen".